JP6537182B2 - Wind noise reduction structure of vehicle - Google Patents

Description

  The present invention relates to a wind noise reduction structure of a vehicle for suppressing wind noise generated near a front pillar.

  Vehicles, such as a motor vehicle, have the windshield provided in the upper part of the front side of the compartment, and the front pillar provided in the width direction both sides of a windshield. The front pillar is inclined rearward with the windshield from the lower end side toward the upper end side, and the side window is located on the rear side. At the lower end of the windshield, a cowl extending in the vehicle width direction of the body is installed, and the discharge of rainwater that has fallen from the windshield to the outside of the vehicle and the introduction of outside air to the compartment take place via this cowl (for example, Patent Document 1).

  The cowl is disposed between the windshield and the front hood, and in recent years, a bowl-shaped cowl panel has become mainstream instead of a box-shaped cowl box. Usually, the cowl panel is manufactured by resin injection molding, and a U-shaped cross-sectional shape or a V-shaped cross-sectional shaped ridge is formed immediately below the front glass, and both ends thereof are positioned inside the front fender in the width direction . In addition, the ridge is curving so that it may go back as it goes to the left and right from the center so that a curve may be followed in a plane view in a windshield lower end (for example, refer to patent documents 2).

JP-A-8-127365 JP 2000-280934 A

  When the vehicle is traveling, engine noise, tire noise, various wind noises and the like become noises for the occupants, which is a factor that impairs the occupants' comfort. In particular, wind noise in the vicinity of the front pillar (hereinafter simply referred to as wind noise) occurs at a portion near the head of the driver's seat or the passenger's seat occupant, which causes the loss of the vehicle's comfort. Wind noise is generated by air flowing along the front of the windshield and flowing backward from the front pillar. That is, the air flowing along the front of the windshield becomes a longitudinal vortex that wraps around the center of the vehicle body immediately after peeling off at the rear edge of the front pillar, and generates wind noise by colliding with the air flowing to the side of the front pillar Let

  The size of the wind noise has a positive correlation with the amount of air flowing backward from the front pillar. In an automobile provided with the above-described cowl panel, the flow of air is increased at the lower portion of the front pillar, so that the wind noise becomes large. That is, the air flowing along the front surface of the front hood flows in the width direction in the curved weir space which is curved rearward, after a part of the air is blown into the weir space of the cowl panel. The air that has flowed to both ends in the width direction of the weir space collides with the inner surface in the width direction of the front fender and turns upwards to get over the front fender and circulates in the width direction along the front of the windshield to Merge with the flow of air flowing into the lower part. As a result, the flow rate of the air separated at the lower rear edge of the front pillar is increased, and the above-described longitudinal vortex is increased to increase the wind noise.

  The object of the present invention is to suppress the merging of the flow of air flowing through the weir space of the cowl panel to the flow of air in the vicinity of the front pillar, and to reduce the wind noise. It is in providing a reduction structure.

  In order to achieve the above object, the present invention provides a windshield provided above the main body, and a front provided so as to rise obliquely upward from the main body toward the rear and supporting the side edge of the windshield. A vehicle comprising a pillar and a cowl provided below the windshield and forming a weir space, the side end of the cowl being continuous with the weir space and being open at the side of the main body The air flow discharge passage is provided, and the air flow discharge passage is provided such that the end on the side of the side of the main body is below the end on the side of the weir space.

  As a result, the air flowing in the width direction in the weir space of the cowl is guided to the air flow discharge path and discharged from a position spaced downward from the rising start portion of the front pillar with respect to the main body.

  According to the present invention, the air flowing in the width direction of the weir of the cowl can be guided to the air flow discharge path and can be discharged from a position spaced downward from the rising start portion of the front pillar to the main body. It is possible to suppress the merging of the flow of the air flowing through the weir space of the cowl with the flow of the air in the vicinity of the front pillar, and it is possible to reduce the wind noise.

FIG. 1 is an overall perspective view of a vehicle showing an embodiment of the present invention. It is an enlarged plan view of A part in FIG. It is an enlarged side view of the A section in FIG. It is a BB expanded sectional view in FIG. It is CC expanded sectional view in FIG. It is a principal part top view which shows the effect | action of embodiment. It is a principal part side view showing an operation of an embodiment.

  1 to 7 show an embodiment of the present invention.

  The automobile 1 as a vehicle provided with the wind noise reduction structure of the present invention is a sedan type passenger car, and as shown in FIG. 1, the front fender 2, front hood 3, front door 4, rear door 5, rear fender 6 etc. It has a main body 10 as an outer shell. A front pillar 11, a center pillar 12, and a rear pillar 13 extend upward from the main body 10, and a roof 14 is supported at the upper ends of the pillars 11 to 13.

  The front pillar 11 and the roof 14 support an outer edge of a windshield 15 that defines an upper front surface of a cabin. The windshield 15 has a curved shape in which the whole is inclined backward, and the front pillar 11 is inclined backward according to the inclination of the side end of the windshield 15. Side glasses 16 and 17 are held up and down freely at the front door 4 and the rear door 5 respectively, and a door mirror 18 is attached to the upper part of the front door 4.

  A cowl panel 20 of a resin injection molded product is mounted along the vehicle width direction in front of the lower edge of the windshield 15. As shown in FIG. 4, the cowl panel 20 has a ridge 21 having an arc cross-sectional shape, in order to discharge rainwater flowing from the front hood 3 and the windshield 15 when traveling in the rain. The weir groove 21 is curved toward the rear from the center to the left and right along the curve on the lower end side of the windshield 15 and is substantially between the extension L of the front hood 3 to the rear A weir space 22 of semicircular cross section is defined.

  As shown in FIG. 2, the cowl panel 20 is formed with a plurality of external air introduction holes 23 for introducing external air into the vehicle compartment, and a rubber seal 24 closely attached to the lower surface of the front hood 3 attached to the front end There is. The cowl panel 20 covers a wiper mechanism (a wiper motor or a wiper arm) or the like (not shown) attached to the bulkhead.

  As shown in FIG. 3, the front fender 2 is formed with an air flow discharge hole 31 as an oblong opening that is long in the front and back. The air flow discharge hole 31 is directly below the base of the front pillar 11 in the front-rear direction, below the rising start portion of the front pillar 11 with respect to the main body 10 in the vertical direction, and below the inner end of the air flow discharge duct described later. It is located at the rear.

  At the side end of the cowl panel 20, a cylindrical air flow discharge duct 41 made of a resin injection molded product is installed to connect the weir space 22 and the air flow discharge hole 31 of the front fender 2. The air flow discharge duct 41 has a substantially constant flow passage cross-sectional area over the entire length, and as shown in FIG. 2, it is inclined from the inner end (air flow introduction side) 41a to the outer end (air flow discharge side) 41b. While extending rearward, as shown in FIG. 5, the outer end 41b side extends obliquely downward. The air flow discharge duct 41 has its front and rear width enlarged toward the rear of the vehicle near the outer end 41 b, and the outer end 41 b is fitted in the air flow discharge hole 31.

  In the automobile 1 configured as described above, when traveling forward, most of the air flowing through the upper part of the front hood 3 flows backward from the windshield 15 via the roof 14 and the front pillar 11, Part air flows into the weir space 22 of the cowl panel 20.

  The air that has flowed in the width direction along the front surface of the windshield 15 and has flowed to the rear edge of the front pillar 11 is immediately after peeling off at the rear edge of the front pillar 11 as shown by the arrows in FIGS. It becomes a vertical vortex that wraps around to the center of the vehicle body, and generates wind noise by colliding with air flowing through the side of the front pillar 11.

  On the other hand, as shown in FIGS. 6 and 7, the air flowing into the weir space 22 circulates in the weir space 22 toward the end in the width direction along the weir groove 21 curved so that both end sides are directed backward. After being introduced into the air flow discharge duct 41, the air passes through the air flow discharge duct 41 and is discharged from the air flow discharge hole 31 spaced downward from the rising start portion of the front pillar 11. At this time, since the air flow discharge duct 41 extends obliquely backward and the outer end 41b side extends obliquely downward, the air flowing through the air flow discharge duct 41 is, as shown in FIG. It is discharged diagonally backward and downward. As a result, the air flowing into the cowl panel 20 flows together with the air flowing to the side of the front door 4 and flows away from the front pillar 11 so that it becomes difficult to join the air flowing through the front pillar 11 side. An increase in wind noise caused by the intensification of Since the longitudinal width of the air flow discharge duct 41 is enlarged toward the rear of the vehicle in the vicinity of the outer end 41b, the air can be smoothly discharged from the air flow discharge hole 31 obliquely backward.

  As described above, according to the wind noise reduction structure of the vehicle of the present embodiment, the air is connected to the weir space 22 at the side end of the cowl panel 20 and the air having the airflow discharge hole 31 on the side surface of the main body 10 A flow discharge duct 41 is provided, and the air flow discharge duct 41 is provided with an outer end 41 b below the inner end 41 a.

  As a result, the air flowing in the width direction of the weir space 22 of the cowl panel 20 can be guided to the air flow discharge duct 41 and discharged from a position spaced downward from the rising start portion of the front pillar 11. It is possible to suppress the merging of the flow of air flowing through the weir space 22 of the cowl panel 20 with respect to the flow of air in the lower part of the pillar 11, and it is possible to reduce wind noise.

  Further, at least the outer end 41 b side of the air flow discharge duct 41 extends obliquely downward.

  As a result, the air flowing through the air flow discharge duct 41 can be discharged downward from the air flow discharge hole 31 and can be circulated away from the front pillar 11 so that the air flows in the lower portion of the front pillar 11. It is possible to more reliably suppress the merging of the flows of air flowing through the weir space 22 of the cowl panel 20.

  Further, at least the outer end 41 b side of the air flow discharge duct 41 extends obliquely rearward.

  As a result, the air flowing through the air flow discharge duct 41 can be discharged rearward from the air flow discharge hole 31 and can be circulated away from the front pillar 11 in a rearward direction. It is possible to more reliably suppress the merging of the flows of air flowing through the weir space 22 of the cowl panel 20.

  In addition, the air flow discharge path is enlarged with the outer end 41 b rearward.

  As a result, the air flowing through the air flow discharge duct 41 is smoothly discharged rearward from the air flow discharge hole 31. Therefore, the air flowing into the cowl panel 20 is more surely separated from the front pillar 11 to flow backward. It becomes possible.

  The present invention is not limited to this embodiment, and various modifications can be made. For example, although the above-mentioned embodiment applies the present invention to a sedan type passenger car, it is naturally applicable to a one box type automobile, a minivan type (so-called 1.5 box type) automobile, a convertible type automobile, etc. is there. Further, the air flow discharge holes are not limited to the front fender exemplified in the above embodiment, but may be installed on the front pillar, the front door, or the front hood according to the difference in the body configuration or the dimensions of each part.

  Further, in the above embodiment, the air flow exhaust duct is inclined obliquely backward, but may be extended laterally from the weir space. Further, although the air flow discharge duct of the embodiment has a substantially constant flow path cross sectional area, the flow path cross sectional area gradually decreases toward the air flow discharge hole 31 and is discharged from the air flow discharge hole 31. The flow velocity of the air flow may be increased. In addition, the cowl panel may be a press-formed product such as a steel plate, or may have a V-shaped cross-sectionally shaped wedge groove that defines a wedge space having an inverted triangular cross section.

  DESCRIPTION OF SYMBOLS 1 ... Car 2, 2 ... Front fender, 3 ... Front hood, 10 ... Main body, 11 ... Front pillar, 15 ... Front glass, 20 ... Cowl panel, 21 ... A groove, 22 ... A space, 31 ... Airflow discharge hole , 41 ... air flow discharge duct, 41a ... inner end, 41b ... outer end.

Claims (5)

A front glass provided above the main body, a front pillar provided so as to rise obliquely upward rearward from the main body and supporting the side edge of the front glass, and provided below the front glass A vehicle comprising a cowl constituting a space,
The side end of the cowl is provided with an air flow discharge path continuous with the weir space and having an opening at the side of the main body,
A wind noise reduction structure for a vehicle, wherein the air flow discharge path is provided with an end on the side surface side of the main body below an end on the side of the weir space. The wind noise reduction structure for a vehicle according to claim 1, wherein at least a side of the main body of the air flow discharge path extends obliquely downward. The wind noise reduction structure for a vehicle according to claim 1 or 2, wherein at least a side surface side of the main body of the air flow discharge path extends obliquely backward. The wind noise reduction structure for a vehicle according to claim 3, wherein an end of the side surface side of the main body of the air flow discharge path is expanded rearward. The opening of the air flow discharge path is formed in any one of a front fender, the front pillar, a door, and a front hood that constitutes the main body. Noise reduction structure of vehicles.

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